<?php
/**
 * AccessControl
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category    ZetaPrints
 * @package     ZetaPrints_AccessControl
 * @copyright   Copyright (c) 2011 ZetaPrints Ltd. http://www.zetaprints.com/
 * @author      Anatoly A. Kazantsev <anatoly.kazantsev@gmail.com>
 * @attribution Vinai Kopp http://www.magentocommerce.com/extension/reviews/module/635
 * @license     http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

class ZetaPrints_AccessControl_Block_Catalog_Product_Helper_Customergroups
  extends Varien_Data_Form_Element_Multiselect {

  public function getValue () {
    $value = parent::getValue();

    if (is_null($value))
      return ZetaPrints_AccessControl_Helper_Data::USE_DEFAULT;

    return $value;
  }
}

?>
